反应详情

Active charcoal (30 mg) and trichloromethyl chloroformate (1.06 ml) were added to a solution of (2S)-2-hydroxy-3-phenylpropionic acid benzyl ester (3.0 g) in dry tetrahydrofuran (10 ml) and the mixture was stirred at room temperature overnight. A solution of piperidine (3.47 ml) and triethylamine (4.89 ml) in dichloromethane (10 ml) was added and the mixture was stirred at room temperature for 30 minutes. The reaction mixture was filtered and the filtrate was concentrated under reduced pressure. Ethyl acetate (50 ml) was added and the mixture was washed with 0.01N hydrochloric acid, a saturated aqueous solution of NaHCO3 and saturated brine. The organic layer was dried over MgSO4 and the solvent was distilled away under reduced pressure. The residue was purified by silica gel column chromatography (eluted with AcOEt/Hex=1/9→2/8 v/v) to give 4.71 g of the title compound as a colorless oil (see Table 9).

1. stirringthe mixture was stirred at room temperature for 30 minutes
2. filtrationThe reaction mixture was filtered
3. concentrationthe filtrate was concentrated under reduced pressure
4. additionEthyl acetate (50 ml) was added
5. washthe mixture was washed with 0.01N hydrochloric acid
6. dry with materialThe organic layer was dried over MgSO4
7. distillationthe solvent was distilled away under reduced pressure
8. customThe residue was purified by silica gel column chromatography (eluted with AcOEt/Hex=1/9→2/8 v/v)